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Synthesis of Suspension Grafting Poe-g-san and Its Toughening Effect on San Resin

Author: LinCheng
Tutor: WangLianShi
School: South China University of Technology
Course: Materials Science
Keywords: The suspension method grafted modified Ethylene-1 - octene copolymer - styrene - acrylonitrile graft copolymer Relative molecular mass Styrene - acrylonitrile copolymer Blends Phase structure Toughening mechanism
CLC: TQ325.14
Type: Master's thesis
Year: 2010
Downloads: 46
Quote: 1
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Abstract


Suspension graft copolymerization with the ethylene-1 - octene copolymer (POE) and styrene - acrylonitrile (St-AN), synthetic graft POE St-AN copolymer (POE-g-SAN), with its The with SAN resin blends prepared a AOS has excellent aging yellowing performance and high-impact performance. No carbon - carbon double bond due to the the POE molecular chain on the AOS has excellent thermal oxidative aging and anti-aging yellowing properties, is a new generation of superior engineering plastic than ABS, and has good prospects for the development of this new high performance engineering plastics not been reported in the literature. This is the first system studied suspension POE / St-AN graft copolymerization system, the quality of the monomer feed ratio (FAN), the PoE the dosage (fPOE) initiator agent BPO dosage, the amount of the solvent toluene, primary dispersant polyvinyl alcohol ( PVA) dosage amount of co-dispersing agents, water / oil ratio, reaction temperature, reaction time and other reaction conditions on the conversion rate (CR), the graft rate (GR), the graft efficiency (GE), the rubber graft rate (GRR) , true grafting yield (GRT) influence of, and AOS impact toughness, discovery fAN, GRR is a key factor of POE-g-SAN SAN resin toughening efficiency, and determine the best toughening efficiency POE- g-SAN synthetic formulation. POE-g-SAN synthesis of the best recipe CR was 92.1% and 26.7% in GR GE 42.4% the the GRR to 30.9%, 70.1% in GRT AOS's notched impact strength (POE content of 25wt% ) 45.1 kJ/m2, 40 times the SAN resin. Research results show that the reaction time on the graft copolymerization behavioral effects in stage Ⅰ polymerization grafting reaction dominant the the first Ⅱ stage occurs graft copolymerization and non-grafted copolymer competition reaction stage Ⅲ graft The end of the reaction, the reaction system exists only in the non-grafted copolymer of the non-grafted copolymer is formed. GPC analysis showed that the GPC analysis showed that the relative molecular mass of POE-g-SAN increases, as fPOE increases first and then decreases gradually with increasing fAN the. Under the same conditions as the polarity of the graft chain, the relative molecular mass of the larger POE-g-SAN has a better toughening effect when the relative molecular mass of the POE-g-SAN Mn of 8.6 x 104, Mw was 21.8 × 104 toughening effect. By transmission electron microscopy (TEM) and scanning electron microscopy (SEM) analysis showed that the main factors influence the the AOS-phase structure and the toughening mechanism is the content of the POE-g-SAN graft chain polarity and POE in the AOS. 35wt% to fAN fPOE synthetic 60wt% POE-g-SAN the appropriate polarity graft chain when the content of 25wt%, POE in AOS matrix was nearly continuous phase structure, the AOS toughening mechanism for substrate the height of the shear yield, and therefore the AOS has good impact toughness. With increasing POE content, the blend of the toughening mechanism first crack branching terminate both the small amount of cavitation, followed cavitation both the crack branching terminate height cavitation Chief slight shear yield yield high shear matrix. DMA analysis showed that, compared with the the PoE elastomer Tg and the Tg of the SAN resin, the Tg of the POE phase Tg and the SAN phase mutually closer, confirmed POE-g-SAN and SAN resins have good compatibility. TG / DTG analysis showed that the the AOS thermal decomposition temperature is increased with increasing FAN and POE content, and POE-g-SAN added AOS of a higher thermal stability than the SAN resin.

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polymer resin and plastic > Polyolefin plastic > Polypropylene
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